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Cisco ME 3800X and ME 3600X Switch Command Reference
OL-28238-01
Chapter 2 Cisco ME 3800X and ME 3600X Switch Cisco IOS Commands
lacp system-priority
lacp system-priority
To configure the system priority for the Link Aggregation Control Protocol (LACP), use the lacp
system-priority command in global configuration mode. To return to the default setting, use the no form
of this command.
lacp system-priority priority
no lacp system-priority
Syntax Description
Defaults The default is 32768.
Command Modes Global configuration
Command History
Usage Guidelines The lacp system-priority command determines which switch in an LACP link controls port priorities.
Although this is a global configuration command, the priority only takes effect on EtherChannels that
have physical ports that are already configured for LACP.
An LACP channel group can have up to 16 Ethernet ports of the same type. Up to eight ports can be
active, and up to eight ports can be in standby mode. When there are more than eight ports in an LACP
channel group, the switch on the controlling end of the link uses port priorities to determine which ports
are bundled into the channel and which ports are put in hot-standby mode. Port priorities on the other
switch (the noncontrolling end of the link) are ignored.
In priority comparisons, numerically lower values have higher priority. Therefore, the switch with the
numerically lower system value (higher priority value) for LACP system priority becomes the
controlling switch. If both switches have the same LACP system priority (for example, they are both
configured with the default setting of 32768), the LACP system ID (the switch MAC address) determines
which switch is in control.
The lacp system-priority command applies to all LACP EtherChannels on the switch.
Use the show etherchannel summary privileged EXEC command to see which ports are in the
hot-standby mode (denoted with an H port-state flag).
For more information about configuring LACP on physical ports, see the “Configuring EtherChannels”
chapter in the software configuration guide for this release.
You can verify the configuration by entering the show lacp sys-id privileged EXEC command.
priority System priority for LACP. The range is 1 to 65535.
Release Modification
12.2(52)EY This command was introduced.
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